It is by means of the Holy Ghost that personal revelations are received. It is the Spirit that communicates with our spirit in receiving revelation. The Savior promised, “God shall give unto you knowledge by his Holy Spirit” (D&C 121:26).
The Spirit communicates our prayers to Heavenly Father. Paul taught the Romans this principle when he said, “The Spirit also helpeth . . . : for we know not what we should pray for as we ought: but the Spirit itself maketh intercession for us with groanings which cannot be uttered” (Romans 8:26).
The Prophet Joseph Smith explained: All things whatsoever God in his infinite wisdom has seen fit and proper to reveal to us, while we are dwelling in mortality . . . are revealed to our spirits precisely as though we had no bodies at all; and those revelations which will save our spirits will save our bodies. [Teachings, p. 355]